The invention discloses an agricultural fertilization device. The agricultural fertilization device comprises a mobile vehicle body and a fertilization device in the mobile vehicle body. The top section of the fertilization device stretches out of the end surface of the top of the mobile vehicle body and the top end surface is fixedly provided with a feeding tank. A first cavity is arranged in thefertilization device. A first funnel cavity is communicated with the top of the first cavity. A second funnel cavity is communicated with the bottom of the first cavity. A feeding inlet extending upward is communicated with the top of the first funnel cavity. A second cavity is arranged in the wall of the fertilization device in the left side of the first cavity. A third cavity is arranged in thewall of the fertilization device in the right side of the first cavity. A first sliding groove extending downward is communicated with the bottom of the first cavity. The extending tail end of the bottom of the first sliding groove passes through the end surface of the bottom of the fertilization device. A second sliding groove extending to right is communicated with the right inner wall of the feeding inlet. The device has a simple structure, is easy to operate and realizes reciprocating drilling processes and caking fertilizer crushing under automatic control.